 Mozart joined the lodge called "Zur Wohltätigkeit" ("Beneficence") on 14 December 1784, and Haydn applied to the lodge "" ("True Concord") on 29 December 1784.Lodge records show that Mozart frequently attended "Zur wahren Eintracht" as a visitor.Haydn's admission ceremony was held on 11 February 1785; Mozart could not attend due to a concert that night.